thymomaPronunciation: /ˈθʌɪməʊmə/Definition of thymoma noun (plural thymomas or thymomata /-mətə/) Medicine a rare, usually benign tumour arising from thymus tissue and sometimes associated with myasthenia gravis. Origin: early 20th century: from thymus + -omathymoma in other Oxford dictionaries Definition of thymoma in the US English dictionary
